肺动脉高压和肺静脉高压可同时存在的疾病是下述哪一种()A.二尖瓣狭窄 B.二尖瓣关闭 发布时间:2017-06-22 19:13 │ 来源:www.tikuol.com 题型:单项选择题 问题: 肺动脉高压和肺静脉高压可同时存在的疾病是下述哪一种()A.二尖瓣狭窄B.二尖瓣关闭不全C.主动脉瓣关闭不全D.主动脉瓣狭窄E.三尖瓣关闭不全
题型:单项选择题 The bell is ringing! It's time _____ lessons.[ ]A. to have B. to having C. having D. have 查看答案